Is GoEco volunteering in China trustworthy?

I was looking into volunteering in China and the GoEco ones looked interesting. There are two that I have found, one a month long and one for a week in Chengdu with pandas. I can’t seem to find any reviews for these from any source that isn’t GoEco itself which seems a little untrustworthy to me so is there anyone who has been on one of these trips who could tell me how it was?